Download Messages Beta and get a taste of what's coming in OS X Mountain Lion. When you install Messages, it replaces iChat. But iChat services will continue to work. And Messages brings iMessage to the Mac -- just like on iPad, iPhone, and iPod touch running iOS 5.

Send unlimited iMessages to any Mac, iPad, iPhone, or iPod touch.*

Start an iMessage conversation on your Mac and continue it on your iPad, iPhone, or iPod touch.